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Description of problem:
A malloc()ed block is free()d twice when running the testcase libio/tst-fopenloc.


Version-Release number of selected component (if applicable):
glibc-2.3.2-11.9

How reproducible:
Always

Steps to Reproduce:
1.Run testcase libio/tst-fopenloc with breakpoints at __gconv_release_cache,
__gconv_release_step, and __gconv_lookup_cache+289 (just after the call to
malloc() at line 360).
2. At each breakpoint, print $eax, which contains the pointer of interest.
3.

Actual Results:   Note that the first block allocated [the call to malloc() in
__gconv_lookup_cache] is freed once from __gconv_release_cache and once from
__gconv_release_step.

Expected Results:  No block is referenced after it is free()d.

Additional info:

Here is the error report from a commercial tool.  valgrind ought to report
similarly.

[gconv_db.c:199] (Thread 0) **READ_DANGLING**
>>   if (--step->__counter == 0)

  Reading from a dangling pointer.

  Pointer : 0x0804ae98
  In block: 0x0804ae90 thru 0x0804af07 (120 bytes)
                  block allocated at gconv_cache.c, 360
            __gconv_lookup_cache()  gconv_cache.c, 360
          __gconv_find_transform()  gconv_db.c, 689
                 __wcsmbs_getfct()  wcsmbsload.c, 92
             __wcsmbs_named_conv()  wcsmbsload.c, 244
              _IO_new_file_fopen()  fileops.c, 53
                __fopen_internal()  iofopen.c, 92
                   _IO_new_fopen()  iofopen.c, 106
                            main()  tst-fopenloc.c, 42

stack trace where memory was freed:
           __gconv_release_cache()  gconv_cache.c, 447
              _IO_new_file_fopen()  fileops.c, 403
                __fopen_internal()  iofopen.c, 92
                   _IO_new_fopen()  iofopen.c, 106
                            main()  tst-fopenloc.c, 42

  Stack trace where the error occurred:
            __gconv_release_step()  gconv_db.c, 199
                  _IO_new_fclose()  iofclose.c, 76
                            main()  tst-fopenloc.c, 59